2D/2D h-BN/N-doped MoS2 Heterostructure Catalyst with Enhanced Peroxidase-like Performance for Visual Colorimetric Determination of H2O2

Recently, nanozymes have attracted extensive attention because of their advantages of combining nanomaterials with enzymes. Herein, hexagonal boron nitride (h-BN) and nitride-doped molybdenum disulfide (N-MoS2) nano-composites (h-BN/N-MoS2) were synthesized by facile and cost-effective liquid exfoliation with a solvothermal method in nontoxic ethanol solution. The results show that h-BN, as a co-catalyst, can not only dope into the lattice of MoS2 but also form a heterogeneous structure with MoS(2)NSs. It expanded the layer spacing and specific surface area of MoS(2)NSs, which was beneficial to the contact between the catalyst and the substrate, and resulted in a synergistic enhancement of the catalytic activity of hydrogen peroxide (H2O2) with MoS2. A colorimetric determination platform of h-BN/N-MoS2-TMB-H2O2 was constructed. It exhibited a wide linear range of 1-1000 mu M with a low limit of detection (LOD) of 0.4 mu M under optimal conditions, high sensitivity and stability, as well as good reliability (99.4-110.0%) in practice, making the measurement system more widely applicable.1. Introduction